ntruchsess/perl-firmata — pull request #23 by yanick (2014-06-29 16:27:22+00:00)
Title: or is too low precedence

Line 86 doesn't do what you hope it does. :-) the low-precedence 'or' means that Perl sees the line as

```
return( ... ) or die ...
```

which means it'll always return, even if `listen` returns a false value.